Corrosion studies of Al-Mg-Sc-Zr Alloy with Low Sc/Zr ratio fabricated by laser powder bed fusion for marine environments

IF 2.7 4区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY Materials Letters Pub Date : 2024-10-29 DOI:10.1016/j.matlet.2024.137595

Ajaykumar Udayraj Yadav , Priyanshu Bajaj , R.L. Narayan , K.S.N. Vikrant

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Abstract

This study investigates the corrosion behavior of a laser powder bed fusion (LPBF) Al-Mg-Sc-Zr alloy with a Sc/Zr ratio of less than 1 in 3.5wt% NaCl solution. X-ray diffraction (XRD) analysis revealed the presence of an Al matrix with face-centered cubic (FCC) structure and the secondary phase Al₃(Sc,Zr) with L1₂ crystal structure. Microstructural analysis indicated a bimodal grain size distribution with fine equiaxed and columnar grains influenced by thermal gradients and secondary phase Al₃(Sc,Zr). Potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) tests in 3.5wt% NaCl solution demonstrated that the alloy exhibits a less negative corrosion potential (E_corr) and lower corrosion current density (i_corr) compared to other Al-Mg-Sc-Zr alloys with higher Sc/Zr ratios, indicating superior corrosion resistance. The enhanced performance is attributed to the fine grain structure and the formation of a stable protective oxide layer facilitated by the higher Zr content.

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通过激光粉末床熔融技术制造的低 Sc/Zr 比率 Al-Mg-Sc-Zr 合金在海洋环境中的腐蚀研究

本研究探讨了激光粉末床熔化（LPBF）Al-Mg-Sc-Zr 合金在 3.5wt% NaCl 溶液中的腐蚀行为，Sc/Zr 比小于 1。X 射线衍射（XRD）分析表明，合金基体为面心立方（FCC）结构，次生相 Al3(Sc,Zr) 为 L12 晶体结构。微观结构分析表明，受热梯度和次生相 Al3（Sc,Zr）的影响，晶粒尺寸呈双峰分布，既有细小的等轴晶粒，也有柱状晶粒。在 3.5wt% NaCl 溶液中进行的电位极化和电化学阻抗谱（EIS）测试表明，与其他 Sc/Zr 比值较高的 Al-Mg-Sc-Zr 合金相比，该合金的负腐蚀电位（Ecorr）较低，腐蚀电流密度（icorr）也较低，这表明该合金具有优异的耐腐蚀性能。性能的提高归功于细晶粒结构和较高的 Zr 含量促进了稳定的氧化保护层的形成。

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来源期刊

Materials Letters 工程技术-材料科学：综合

CiteScore

5.60

自引率

3.30%

发文量

1948

审稿时长

50 days

期刊介绍： Materials Letters has an open access mirror journal Materials Letters: X, sharing the same aims and scope, editorial team, submission system and rigorous peer review. Materials Letters is dedicated to publishing novel, cutting edge reports of broad interest to the materials community. The journal provides a forum for materials scientists and engineers, physicists, and chemists to rapidly communicate on the most important topics in the field of materials. Contributions include, but are not limited to, a variety of topics such as: • Materials - Metals and alloys, amorphous solids, ceramics, composites, polymers, semiconductors • Applications - Structural, opto-electronic, magnetic, medical, MEMS, sensors, smart • Characterization - Analytical, microscopy, scanning probes, nanoscopic, optical, electrical, magnetic, acoustic, spectroscopic, diffraction • Novel Materials - Micro and nanostructures (nanowires, nanotubes, nanoparticles), nanocomposites, thin films, superlattices, quantum dots. • Processing - Crystal growth, thin film processing, sol-gel processing, mechanical processing, assembly, nanocrystalline processing. • Properties - Mechanical, magnetic, optical, electrical, ferroelectric, thermal, interfacial, transport, thermodynamic • Synthesis - Quenching, solid state, solidification, solution synthesis, vapor deposition, high pressure, explosive